Primary Industries and Region's SA is upping its protection level this summer through a number of measures.

In the Mallee, the permanent roadblock quarantine station at Pinnaroo will be open for twice as many hours this summer and will close a month later than usual.

The number of mobile random roadblocks will also double this season, with most to be conducted in the Riverland.

Travellers who fail to declare fruit or vegetables face fines of $375.

To increase public awareness, PIRSA will distribute fruit fly literature to information centres, caravan parks, general stores, motels and houseboat hire companies in SA, New South Wales and Victoria.

Commercial deliveries of fruit into the Riverland will also be heavily scrutinised with more trucks and vehicles subject to audits.

The state's four quarantine station sites at Yamba, Pinnaroo, Ceduna and Yunta will have electronic billboards onsite, warning travellers not to bring fruit into South Australia or into the Riverland from other areas of the state.

At a grower level, producers will be encouraged to take part in a farm hygiene 'clean up' campaign to ensure fallen fruit is disposed of correctly.

The State Government also recently announced it would build a $3 million dollar sterile fruit fly production facility at Port Augusta to combat future outbreaks.

Minister for Agriculture Gail Gago says the decision by the eastern states to reduce their fruit fly control programs led to these increased measures.

"We have to do this, the deregulation of activities, particularly in Victoria have exposed us to increased risk here in South Australia," she said.

"They've reduced their status now to an endemic status, they are no longer eradicating fruit fly except in the Sunraysia area.